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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5caf84bb32e4dc7fc942c440888b5e06823e7e4d4ed9d7a294150e30ec9b06a' 
  AND token = 'nQZkPHrt/FfvGUkyj6CJ6YeGhPZ2KO3pVD68tNCB4bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}